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Ultrafast optical tuning of ferromagnetism via the carrier density

Author

Listed:
  • Masakazu Matsubara

    (Tohoku University
    ETH Zurich)

  • Alexander Schroer

    (Physikalisches Institut, Universität Bonn)

  • Andreas Schmehl

    (Institut für Physik, Universität Augsburg)

  • Alexander Melville

    (Cornell University)

  • Carsten Becher

    (ETH Zurich)

  • Mauricio Trujillo-Martinez

    (Physikalisches Institut, Universität Bonn)

  • Darrell G. Schlom

    (Cornell University
    Kavli Institute at Cornell for Nanoscale Science)

  • Jochen Mannhart

    (Max Planck Institute for Solid State Research)

  • Johann Kroha

    (Physikalisches Institut, Universität Bonn)

  • Manfred Fiebig

    (ETH Zurich)

Abstract

Interest in manipulating the magnetic order by ultrashort laser pulses has thrived since it was observed that such pulses can be used to alter the magnetization on a sub-picosecond timescale. Usually this involves demagnetization by laser heating or, in rare cases, a transient increase of magnetization. Here we demonstrate a mechanism that allows the magnetic order of a material to be enhanced or attenuated at will. This is possible in systems simultaneously possessing a low, tunable density of conduction band carriers and a high density of magnetic moments. In such systems, the thermalization time can be set such that adiabatic processes dominate the photoinduced change of the magnetic order—the three-temperature model for interacting thermalized electron, spin and lattice reservoirs is bypassed. In ferromagnetic Eu1−xGdxO, we thereby demonstrate the strengthening as well as the weakening of the magnetic order by ~10% and within ≤3 ps by optically controlling the magnetic exchange interaction.

Suggested Citation

  • Masakazu Matsubara & Alexander Schroer & Andreas Schmehl & Alexander Melville & Carsten Becher & Mauricio Trujillo-Martinez & Darrell G. Schlom & Jochen Mannhart & Johann Kroha & Manfred Fiebig, 2015. "Ultrafast optical tuning of ferromagnetism via the carrier density," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7724
    DOI: 10.1038/ncomms7724
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    Cited by:

    1. Xianyang Lu & Zhiyong Lin & Hanqi Pi & Tan Zhang & Guanqi Li & Yuting Gong & Yu Yan & Xuezhong Ruan & Yao Li & Hui Zhang & Lin Li & Liang He & Jing Wu & Rong Zhang & Hongming Weng & Changgan Zeng & Yo, 2024. "Ultrafast magnetization enhancement via the dynamic spin-filter effect of type-II Weyl nodes in a kagome ferromagnet," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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